TM 1-1510-225-10 3C-18 2. To skip an item, press SKIP. Note that the red cursor moves to the next item and that the skipped item remains displayed in green. 3. To return to an unchecked item, press RCL. The display will return to the first page containing an unchecked item, with that item displayed in red. 4. When the last unchecked item in the emergency procedure is checked off and all previous items in the procedure have been checked and LINEis pressed, the word COMPLETEis printed in red in the center of the last available line on the last page of the procedure. (11) Re-initialization. If the checklist display is not functioning properly, re-initialize the checklist operation as follows: 1. Set rotary switch to OFF. 2. Set rotary switch to any desired INDEXor LISTposition. 3. Press PAGE push button to display first page of chosen index or list. (12) Auxiliary. When the rotary switch on the control unit is set to AUX, the interface computer is available for inputs from the auxiliary equipment. (13) Pilot Entry Keyboard. The operator may use a hand-held keyboard, Figure 3C-9, to enter data of his own into a section of the Data NAV system memories for display on the Indicator. Data entered by the pilot is stored in a memory that is not permanent in the same sense as those memories containing the airplane checklists. However, the non-permanent memory is kept alive by a 3.6-volt nickel-cadmium battery that recharges each time the Data NAV system is turned on. Depending upon the state of charge and the storage temperature, the battery could keep the pilot-entered data intact for as long as 6 months. The keyboard coil-cord is plugged directly into a bulkhead-type connector mounted for pilot convenience. The bulkhead connector, in turn, is wired by way of the aircraft wiring to the Data NAV system. NOTE At the top of the keyboard unit is the ON / OFF switch that controls a 5-volt input. Whenever the keyboard is being connected to, or disconnected from, the aircraft connector, this switch must be in the OFF position to prevent possible damage to integrated circuits inside the keyboard. (a) Keyboard Controls.All controls used to operate the keyboard functions are located on the keyboard panel. The keyboard unit has 45 keys consisting of 26 alphabetics (A through Z); 10 numerics (0 through 9); comma; period; dash (); backspace (¬ ); forward space (® ); cursor return (CR); space (SP); home cursor (HC); and mode. The MODEkey selects either the data entry mode or the calculator mode. Alternate functions are available for 13 keys: Clear ( CLR); roll up (- ); clear entry (CLE); enter (ENTER); sign change (+/-); exchange (C ); delete line (DEL); set beginning of stack (SBS); beginning of stack (BOS); and the arithmetic operations (+, , x, ÷). The alternate functions, operational only during the calculator mode, display above the affected keys. 1. ON/OFF Power Switch 2. Data Entry Keyboard Figure 3C-9. Pilot Entry Keyboard